but it was paul walker's role in "the fast and furious" that catapulted him to fame. police still do not know exactly what caused saturday's crash that killed walker and the driver, his friend, pro racer, roger rodas but today authorities revealed this. the car they were in was going very fast and now police are looking for surveillance video for clues. this is something else authorities are looking into. skid marks like these to find out if they came from the car paul walker was in or from someone else on this road known for fast driving. that car they were in, a porsche carrera gt. one of the fastest out there. it sells for more than $400,000, goes from zero to 125 in less than ten seconds and can reach 205 miles per hour. "auto week" magazine says even professional drivers call it scary to handle. just watch the host of the car show "top gear" driving on a race track. >> you need to be awake to drive this car. >> reporter: porsche says it is cooperating with the investigation. as "fast and furious" fans continue to flock to the crash site, walker's family grieves.